Imo the biggest difference is that in the Python / JS world you can be considered a senior developer at many respectable companies and still be clueless about tooling, optimization etc. Most shops (exceptions being places that do a lot of ETL, data processing...) are OK with clunky Python as long as it is not unusable. On the other hand if you are working with C / C++ a more active approach is needed if you don't want your software to blow up.
